<mailet match="InSpammerBlacklist=dnsbl.njabl.org."
                 class="ToProcessor">
           <processor> spam </processor>
           <notice>550 Requested action not taken: rejected - see http://njabl.org/ </notice>
</mailet>

 iterative:

(define (re n)
  (if (< n 3)
      n
      (iter 2 1 0 n)
      ))
(define (iter a b c n)
(if(= n 3)
   (ca a b c)
   (iter (ca a b c) a b (- n 1))
   )
)
(define (ca a b c)
  (+ a (* 2 b) (* 3 c) )
)

(define (new-if predicate then-clause else-clause)
(cond (predicate then-clause)
      (else-clause)))
(define (average x y)
  (/ (+ x y) 2))
(define (improve guess x)
  (average guess (/ x guess)))
(define (good-enough? guess x)
  (< (abs (- (square guess) x))0.001))
(define (square x)
  (* x x))
(define (sqrt-iter guess x)
  (new-if (good-enough? guess x)
          guess
          (sqrt-iter (improve guess x)
                     x)))

sqrt-iter (improve guess x)作为参数来传递给new-if，在执行new-if的时候，就总是会执行sqrt-iter (improve guess x)，造成了死循环。

package com.com;

import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;

public class ActiveUserListener2 implements HttpSessionListener {
    private static int sessionCount2 = 0;
    private static Map sessionMaps2 = new HashMap(); //存放session的集合类

  public void sessionCreated(HttpSessionEvent arg0) {
        HttpSession session = arg0.getSession();
        String sessionId = session.getId();
        System.out.println("Create a session:" + sessionId);
        sessionMaps2.put(sessionId, session);
        sessionCount2++;
 }

  public void sessionDestroyed(HttpSessionEvent arg0) {
        sessionCount2--;
        String sessionId = arg0.getSession().getId();
        sessionMaps2.remove(sessionId);//利用会话ID标示特定会话
        System.out.println("Destroy a session:" + sessionId);
 }
 public static int getSessionCount() {
  return sessionCount2;
    }
    public static Map getSessionMaps() {
     return sessionMaps2;
    }
}

传递sessionid，?jsessionid=<%=session.getId()%>

测试效果：
<%
Map activeSessions = ActiveUserListener2.getSessionMaps();
             out.println(activeSessions.get("CB55ABC39DD5B917D65F456C28FC25E6.tomcat1"));
             out.println(activeSessions);
            }
      }
%>

package client;

import com.google.gwt.user.client.rpc.ServiceDefTarget;
import com.google.gwt.user.client.rpc.RemoteService;
import com.google.gwt.core.client.GWT;

public interface CRUDService extends RemoteService {
     Student[] getStudent(String PageNum)     ;

    String getPagenum();

    public static class App {
        private static CRUDServiceAsync ourInstance = null;

        public static synchronized CRUDServiceAsync getInstance() {
            if (ourInstance == null) {
                ourInstance = (CRUDServiceAsync) GWT.create(CRUDService.class);
                ((ServiceDefTarget) ourInstance).setServiceEntryPoint(GWT.getModuleBaseURL() + "CRUD/CRUDService");
            }
            return ourInstance;
        }
    }
}

package server;

import com.google.gwt.user.server.rpc.RemoteServiceServlet;
import client.CRUDService;
import client.Student;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Hibernate;
import org.hibernate.Query;
import org.hibernate.cfg.Configuration;
import java.util.List;
import java.util.Iterator;

public class CRUDServiceImpl extends RemoteServiceServlet  implements CRUDService {
    private static final SessionFactory sessionFactory;
    String Pagenum = "1";
    static {
            try {
                // Create the SessionFactory from hibernate.cfg.xml
                sessionFactory = new Configuration().configure().buildSessionFactory();
            } catch (Throwable ex) {
                // Make sure you log the exception, as it might be swallowed
                System.err.println("Initial SessionFactory creation failed." + ex);
                throw new ExceptionInInitializerError(ex);
            }
        }

        public static SessionFactory getSessionFactory() {
            return sessionFactory;
        }

    public List ListStudent(String PageNum){
       Session session =  getSessionFactory().getCurrentSession() ;
        session.beginTransaction();
         Query query = session.createSQLQuery("select * from t_student")
        .addScalar("id", Hibernate.LONG)
        .addScalar("name", Hibernate.STRING)
        .addScalar("email", Hibernate.STRING);
        int PageSize = 10;

        try{
            if (Integer.parseInt(PageNum)!=0 | PageNum!=null ){
            query.setFirstResult((Integer.parseInt(PageNum)-1) * PageSize);
            query.setMaxResults(PageSize);
            }else{
            query.setFirstResult(0);
            query.setMaxResults(PageSize);
            }
        }catch(Exception e){
            query.setFirstResult(0);
            query.setMaxResults(PageSize);
        }
        List ls = query.list();
        session.getTransaction().commit();
        return ls;
    }

    public int CountStudent(){
       Session session =  getSessionFactory().getCurrentSession() ;
        session.beginTransaction();
         List ls = session.createSQLQuery("select count(*) from t_student").list();
        session.getTransaction().commit();
        return Integer.parseInt(ls.iterator().next().toString());
    }

        public Student[] getStudent(String PageNum){
             this.setPagenum(PageNum);
             Student[] student = new Student[this.CountStudent()];
            int i = 0;
          for(Iterator it = this.ListStudent(PageNum).iterator();it.hasNext();i++) {
             Object[] ob = (Object[] )it.next();
                student[i]=new Student(ob[0].toString(),ob[1].toString(),ob[2].toString());
              
          }

             return student;
          }

     public void setPagenum(String pagenum){
         this.Pagenum = pagenum;
     }

    public String getPagenum() {
        return Pagenum;  //To change body of implemented methods use File | Settings | File Templates.
    }

}

package client;

import com.google.gwt.user.client.rpc.AsyncCallback;

public interface CRUDServiceAsync {

    void getStudent(String PageNum, AsyncCallback async);

    void getPagenum(AsyncCallback async);
}

package client;

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.client.ui.*;
import com.google.gwt.user.client.rpc.AsyncCallback;

public class CRUD implements EntryPoint {
    private CRUDServiceAsync  crudServiceAsync ;
    VerticalPanel main = new VerticalPanel();
    FlexTable lb = new FlexTable();
    HorizontalPanel hp = new HorizontalPanel();
    Button nextpage = new Button("nextpage");
    Button prepage = new Button("prepage");
    private String pagenum = "1";

    public void setPagenum(String pagenum){
        this.pagenum=pagenum;
    }
    public String getPagenum(){
        return this.pagenum;
    }
    int  prepagenum = 1;
    int  nextpagenum =1;

    public void onModuleLoad() {
        main.add(lb);
        main.add(hp);
        hp.add(prepage);
        hp.add(nextpage);
        RootPanel.get().add(main);
        showstudentlist("1");

       prepage.addClickListener(new ClickListener(){
       public void onClick (Widget sender){
       prepagenum = Integer.parseInt(getPagenum())-1;
       showstudentlist(String.valueOf(prepagenum));
       }
     });

     nextpage.addClickListener(new ClickListener(){
      public void onClick (Widget sender){
       nextpagenum = Integer.parseInt(getPagenum())+1 ;
     showstudentlist(String.valueOf(nextpagenum));
      }
      });
 
    }

     private void  showstudentlist(String pagenum) {
         CRUDService.App.getInstance().getStudent(pagenum,new AsyncCallback(){
                  public void onFailure(Throwable caught) {
                  }
                  public void onSuccess(Object result) {
                    Student s[] = ( Student[])result ;
                      for (int i=0;i<=s.length;i++){
                          lb.setText(i,0,s[i].id);
                          lb.setText(i,1,s[i].name);
                          lb.setText(i,2,s[i].email);
                      }
                  }
              });

        CRUDService.App.getInstance().getPagenum(new AsyncCallback(){
            public void onFailure(Throwable caught) {}
            public void onSuccess(Object result) {
                   setPagenum((String)result);
            }
        });

    }

}

<module>

    <inherits name='com.google.gwt.user.User'/>

    <entry-point class='client.CRUD'/>

    <servlet path="/CRUD/CRUDService" class="server.CRUDServiceImpl"/>
</module>

EntryPoint：CRUD.java，使用VerticalPanel 来显示List：

package client;

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.client.ui.*;
import com.google.gwt.user.client.rpc.AsyncCallback;

public class CRUD implements EntryPoint {
    VerticalPanel main = new VerticalPanel();
    FlexTable lb = new FlexTable();
    public void onModuleLoad() {
        main.add(lb);
        RootPanel.get().add(main);
              CRUDService.App.getInstance().getStudent(new AsyncCallback(){

                  public void onFailure(Throwable caught) {
                      //To change body of implemented methods use File | Settings | File Templates.
                  }

                  public void onSuccess(Object result) {
                    Student s[] = ( Student[])result ;
                      for (int i=0;i<=s.length;i++){
                     lb.setText(i,0,s[i].id);
                          lb.setText(i,1,s[i].name);
                          lb.setText(i,2,s[i].email);                          
                      }
                  }
              }) ;
    }
}

ENTITY：Student.java：

package client;

import com.google.gwt.user.client.rpc.IsSerializable;

public class Student implements IsSerializable {
    public String id,name,email;
    public Student(){
       
    }
    public Student(String id,String name,String email) {
    this.id=id;
    this.name=name;
    this.email=email;   
    }
}

SERVICE：CRUDService.java：

package client;

import com.google.gwt.user.client.rpc.ServiceDefTarget;
import com.google.gwt.user.client.rpc.RemoteService;
import com.google.gwt.core.client.GWT;

public interface CRUDService extends RemoteService {

     Student[] getStudent()     ;

    public static class App {
        private static CRUDServiceAsync ourInstance = null;

        public static synchronized CRUDServiceAsync getInstance() {
            if (ourInstance == null) {
                ourInstance = (CRUDServiceAsync) GWT.create(CRUDService.class);
                ((ServiceDefTarget) ourInstance).setServiceEntryPoint(GWT.getModuleBaseURL() + "CRUD/CRUDService");
            }
            return ourInstance;
        }
    }
}

SERVICEImpl：CRUDServiceImpl.java，这里使用直接连接hibernate的方法用native sql查询数据，不需要专门创建实体类和配置文件：

package server;

import com.google.gwt.user.server.rpc.RemoteServiceServlet;
import client.CRUDService;
import client.Student;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Hibernate;
import org.hibernate.cfg.Configuration;
import java.util.List;
import java.util.Iterator;

public class CRUDServiceImpl extends RemoteServiceServlet  implements CRUDService {
    private static final SessionFactory sessionFactory;      
    static {
            try {
                sessionFactory = new Configuration().configure().buildSessionFactory();
            } catch (Throwable ex) {
                System.err.println("Initial SessionFactory creation failed." + ex);
                throw new ExceptionInInitializerError(ex);
            }
        }

        public static SessionFactory getSessionFactory() {
            return sessionFactory;
        }

    public List ListStudent(){
       Session session =  getSessionFactory().getCurrentSession() ;
        session.beginTransaction();
         List ls = session.createSQLQuery("select * from t_student")
        .addScalar("id", Hibernate.LONG)
        .addScalar("name", Hibernate.STRING)
        .addScalar("email", Hibernate.STRING).list();
        session.getTransaction().commit();
        return ls;
    }

    public int CountStudent(){
       Session session =  getSessionFactory().getCurrentSession() ;
        session.beginTransaction();
         List ls = session.createSQLQuery("select count(*) from t_student").list();
        session.getTransaction().commit();
        return Integer.parseInt(ls.iterator().next().toString());
    }

        public Student[] getStudent(){
             Student[] student = new Student[this.CountStudent()];
            int i = 0;
          for(Iterator it = this.ListStudent().iterator();it.hasNext();i++) {
             Object[] ob = (Object[] )it.next();
                student[i]=new Student(ob[0].toString(),ob[1].toString(),ob[2].toString());
          }
             return student;
          }

}

异步调用类CRUDServiceAsync.java：

package client;

import com.google.gwt.user.client.rpc.AsyncCallback;

public interface CRUDServiceAsync {
    void getStudent(AsyncCallback async);
}

最后，在src目录下创建hibernate.cfg.xml，这里使用mysql：

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
  "-//Hibernate/Hibernate Configuration DTD//EN"
  "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
  <session-factory>
<property name="connection.driver_class">
  com.mysql.jdbc.Driver
 </property>
 <property name="connection.url">
  jdbc:mysql://localhost:3306/mysql
 </property>
 <property name="connection.username">root</property>
 <property name="connection.password">root</property>

 <!-- JDBC connection pool (use the built-in) -->
 <property name="connection.pool_size">1</property>

 <!-- SQL dialect -->
 <property name="dialect">
  org.hibernate.dialect.MySQLDialect
 </property>

 <!-- Enable Hibernate's automatic session context management -->
 <property name="current_session_context_class">thread</property>

 <!-- Disable the second-level cache  -->
 <property name="cache.provider_class">
  org.hibernate.cache.NoCacheProvider
 </property>

 <!-- Echo all executed SQL to stdout -->
 <property name="show_sql">true</property>

 <!-- Drop and re-create the database schema on startup -->
 <property name="myeclipse.connection.profile">mysql for j</property>
  </session-factory>
</hibernate-configuration>

<%@ page  contentType="text/html;  charset=utf-8"%>
<html>
<head>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
     <link href="<%=request.getContextPath() %>/admin/uploadpic/js/default.css" rel="stylesheet" type="text/css" />
 <script type="text/javascript" src="<%=request.getContextPath() %>/admin/uploadpic/js/swfupload.js"></script>
 <script type="text/javascript" src="<%=request.getContextPath() %>/admin/uploadpic/js/handlers.js"></script>
 <script type="text/javascript" src="<%=request.getContextPath() %>/admin/uploadpic/js/fileprogress.js"></script>
    <script type="text/javascript" src="<%=request.getContextPath() %>/admin/uploadpic/js/swfupload.queue.js"></script>
 <script type="text/javascript">
  var swfu;
  window.onload = function () { 
   var settings = {
    // Backend Settings
    file_post_name : "upload",
    upload_url: "<%=request.getContextPath() %>/admin/product/doMultipleUploadUsingList.action", // Relative to the SWF file
    post_params: {"product1": "1"},        
          use_query_string:false,
    // File Upload Settings
    file_size_limit : "100 MB",
    file_types : "*.*",
    file_types_description : "All Files",
    file_upload_limit : 100,
    file_queue_limit : 0,
    custom_settings : {
     progressTarget : "fsUploadProgress",
     cancelButtonId : "btnCancel"
    },
    debug: false,

    // The event handler functions are defined in handlers.js
    file_queued_handler : fileQueued,
    file_queue_error_handler : fileQueueError,
    file_dialog_complete_handler : fileDialogComplete,
    upload_start_handler : uploadStart,
    upload_progress_handler : uploadProgress,
    upload_error_handler : uploadError,
    upload_success_handler : uploadSuccess,
    upload_complete_handler : uploadComplete,
    queue_complete_handler : queueComplete,
    // Flash Settings
    flash_url : "<%=request.getContextPath() %>/admin/uploadpic/js/swfupload_f8.swf" // Relative to this file
    
   };
   swfu = new SWFUpload(settings);
  }
   function uploadStart(file) {
   document.getElementById("back").innerHTML='';
   var post_params = this.settings.post_params;
   post_params.id = document.getElementById("id").value;
   this.setPostParams(post_params);
   return true;
   }           
   <style type="text/css">
   #content button,input,span{
   margin: 5 5 5 5;
   }
   #back{
   width:810;
   height:500;
   float:left;
   text-align:center;
   vertical-align:middle;
   overflow:auto;
   }
   #img2{
   float:left;
   margin: 1 1 1 1;
   text-align:center;
   vertical-align:middle;
   display: table-cell;
   display: block;
   font-size: 68px;
   width:78;
   height:78;
   border: 1px solid #B10000;
   }
   #img2 img{
   vertical-align:middle;
   cursor: pointer;
   }
   #img2 img hover{
   cursor: pointer;
   }  
</style>
</head>
  <div id="SWFUploadTarget" >
<body>

<div id="content">
  <span>1、Product ID</span><input type="text" name="id" id="id" value= <%=request.getParameter("id") %> readonly>
  <button id="btnBrowse" type="button" style="padding: 6px;" onClick="swfu.selectFiles(); this.blur();javascript:document.getElementById('divStatus').innerHTML='';">
  </div>
 </div>
    <p>
   <fieldset class="flash" id="fsUploadProgress">
   <legend>Upload Progress</legend>
   </fieldset>
  <div id="divStatus"></div>
   <div>
    <input id="btnCancel" type="button" value="Cancel All Upload" onClick="swfu.cancelQueue();" disabled="disabled" style="font-size: 8pt;" />

   </div>

<div id="back"></div>
</body>
<html>

MultipleFileUploadUsingListAction是一个可以通用的struts2 action，可以接收批量或单个上传过来的图片。并且可以选择生成相应压缩图。图片生成的命名方式是从xxx_01、xxx_02、xxx_03一直自动排列下去。压缩图为xxx_01_70

package com..web.action;

import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
import com.web.commons.util.DirList;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;

@SuppressWarnings("serial")
public class MultipleFileUploadUsingListAction extends ActionSupport {

    private String id;
    private File[] uploads;
    private String[] uploadFileNames;
    private String[] uploadContentTypes;
   
    public String getId() {
  return id;
 }
 public void setId(String id) {
  this.id = id;
 }
 public File[] getUpload() { return this.uploads; }
    public void setUpload(File[] upload) { this.uploads = upload; }

    public String[] getUploadFileName() { return this.uploadFileNames; }
    public void setUploadFileName(String[] uploadFileName) { this.uploadFileNames = uploadFileName; }

    public String[] getUploadContentType() { return this.uploadContentTypes; }
    public void setUploadContentType(String[] uploadContentType) { this.uploadContentTypes = uploadContentType; }   
 
  public String upload() throws Exception{
   try{
  String productname=id;
  String url = ServletActionContext.getServletContext().getRealPath("Personalizedphoto")+"\\"+id+"\\";
   for (int i=0;i<uploads.length;i++) {
  FileInputStream fis=new FileInputStream(uploads[i]); 
    if(!(new File(url).isDirectory())) 
    { 
    new File(url).mkdir();  
    }
   int temp=1,temp2=1;
   String myFileName = productname+"_0"+temp;
   DirList dirlist = new DirList();
   String[] dir =dirlist.list(url);  
   for(int j=0;j<dir.length;j++){
      String[] split = dir[j].split("\\.");
          if(split[1].equals("jpg")&&split[0].split("\\_").length==3){  
          String[] split2=split[0].split("\\_");
       if(Integer.parseInt(split2[1])>0&Integer.parseInt(split2[1])>=temp2){
       temp2=Integer.parseInt(split2[1])+1;
       }
       if(Integer.parseInt(split2[1])==0){
       temp2=1;
       }
          }
    } 
    if(temp2<10){
    myFileName = productname+"_0"+temp2;
    }else{
    myFileName = productname+"_"+temp2;
    }
    
    FileOutputStream fos=new FileOutputStream(url+myFileName+"_800.jpg");  
  byte[] buffer=new byte[1024];
     int len=0;
     while((len=fis.read(buffer))>0){
         fos.write(buffer, 0, len);
     }

     java.io.File file = new java.io.File(url+myFileName+"_800.jpg");
     String newurl=url+myFileName+"_70.jpg";  
     java.awt.Image src = javax.imageio.ImageIO.read(new java.io.File(url+myFileName+"_800.jpg"));
    
     float tagsize=70;
     int old_w=src.getWidth(null);                             
     int old_h=src.getHeight(null);
     int new_w=0;
     int new_h=0;                           
     float tempdouble;
     if(old_w>old_h){
      tempdouble=old_w/tagsize;
     }else{
      tempdouble=old_h/tagsize;
     }
     new_w=Math.round(old_w/tempdouble);
     new_h=Math.round(old_h/tempdouble);     java.awt.image.BufferedImage tag = new java.awt.image.BufferedImage(new_w,new_h,java.awt.image.BufferedImage.TYPE_INT_RGB); 
     tag.getGraphics().drawImage(src,0,0,new_w,new_h,null);   
     FileOutputStream newimage=new FileOutputStream(newurl);         
     JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(newimage);      
     encoder.encode(tag);                                               
     newurl=url+myFileName+"_130.jpg";  
     tagsize=130;
     if(old_w>old_h){
      tempdouble=old_w/tagsize;
     }else{
      tempdouble=old_h/tagsize;
     }
     new_w=Math.round(old_w/tempdouble);
     new_h=Math.round(old_h/tempdouble);
     tag = new java.awt.image.BufferedImage(new_w,new_h,java.awt.image.BufferedImage.TYPE_INT_RGB);
     tag.getGraphics().drawImage(src,0,0,new_w,new_h,null);
     newimage=new FileOutputStream(newurl);          
     encoder = JPEGCodec.createJPEGEncoder(newimage);      
     encoder.encode(tag); 
     newurl=url+myFileName+"_180.jpg";  
     tagsize=180;
     if(old_w>old_h){
      tempdouble=old_w/tagsize;
     }else{
      tempdouble=old_h/tagsize;
     }
     new_w=Math.round(old_w/tempdouble);
     new_h=Math.round(old_h/tempdouble);
     tag = new java.awt.image.BufferedImage(new_w,new_h,java.awt.image.BufferedImage.TYPE_INT_RGB);
     tag.getGraphics().drawImage(src,0,0,new_w,new_h,null);
     newimage=new FileOutputStream(newurl);         
     encoder = JPEGCodec.createJPEGEncoder(newimage);      
     encoder.encode(tag);                                               
     newurl=url+myFileName+"_500.jpg";  
     tagsize=500;
     if(old_w>old_h){
      tempdouble=old_w/tagsize;
     }else{
      tempdouble=old_h/tagsize;
     }
     new_w=Math.round(old_w/tempdouble);
     new_h=Math.round(old_h/tempdouble);
     tag = new java.awt.image.BufferedImage(new_w,new_h,java.awt.image.BufferedImage.TYPE_INT_RGB);
     tag.getGraphics().drawImage(src,0,0,new_w,new_h,null);
     newimage=new FileOutputStream(newurl);          
     encoder = JPEGCodec.createJPEGEncoder(newimage);      
     encoder.encode(tag);  
     newimage.close();
   } 
   }catch(Exception e){}
   this.setId(id);
   return SUCCESS;
 }
    
 }

这个action还调用了一个类DirList ，是用于扫描当前文件夹里的图片，并且根据当前的命名情况来命名新上传的图片，如原来已经有了10张，那上传之后的就从第11开始命名。

import java.io.File;
import java.io.FilenameFilter;
import java.util.Arrays;
import java.util.Comparator;
import java.util.regex.Pattern;
public class DirList {
 public String[] list(String thepath) {
  File path = new File(thepath); 
  String[] list;  
  list = path.list();
  Arrays.sort(list, new AlphabeticComparator());
  return list;
 }
 
 private void deleteFile(File file){
  if(file.exists()){
  if(file.isFile()){
  file.delete();
  }else if(file.isDirectory()){
  File files[] = file.listFiles();
  for(int i=0;i<files.length;i++){
  this.deleteFile(files[i]);
  }
  }
  file.delete();
  }else{
  }
  }
}

class DirFilter implements FilenameFilter { 
 private Pattern pattern;  public DirFilter(String regex) {
  pattern = Pattern.compile(regex);  }
 public boolean accept(File dir, String name) {  
  // Strip path information, search for regex:  
  return pattern.matcher(new File(name).getName()).matches();
  }
 }

class AlphabeticComparator implements Comparator {
 public int compare(Object o1, Object o2) {  
  String s1 = (String) o1;    String s2 = (String) o2;   
  return s1.toLowerCase().compareTo(s2.toLowerCase()); 
  }
 }

<%@ page  contentType="text/html;  charset=GBK"%>
<%@ page import="javax.servlet.*"%>
<%@ page import="javax.servlet.http.*"%>
<%@ page import="com.yourcompany.util.*"%>
<html>
<head>
 <link href="js/default.css" rel="stylesheet" type="text/css" />
 <script type="text/javascript" src="js/swfupload.js"></script>
 <script type="text/javascript" src="js/handlers.js"></script>
   <script src="js/jquery.js" type="text/javascript"></script>
   <script type="text/javacript">
   function g(){
  $.ajax({
    url: 'upload2.jsp',
    date: {c: $('#c').val(), c: $('#c').val()},
    error: function() { alert"fail"},
    success: function(response) { ... }
    });
  }
   </script>
 <script type="text/javascript">

 var swfu;
  window.onload = function () {
  
   swfu = new SWFUpload({
    // Backend Settings
    upload_url: "upload2.jsp", // Relative to the SWF file
    post_params: {"product1": "1"},
        
        use_query_string:false,
    // File Upload Settings
    file_size_limit : "2048", // 2MB
    file_types : "*.jpg",
    file_types_description : "JPG Images",
    file_upload_limit : "0",

    // Event Handler Settings - these functions as defined in Handlers.js
    //  The handlers are not part of SWFUpload but are part of my website and control how
    //  my website reacts to the SWFUpload events.
    file_queue_error_handler : fileQueueError,
    file_dialog_complete_handler : fileDialogComplete,
    upload_progress_handler : uploadProgress,
    upload_start_handler : uploadStart,
    upload_error_handler : uploadError,
    upload_success_handler : uploadSuccess,
    upload_complete_handler : uploadComplete,

    // Flash Settings
    flash_url : "js/swfupload_f9.swf", // Relative to this file

    custom_settings : {
     upload_target : "divFileProgressContainer"
    },
    
    // Debug Settings
    debug: false
   });
  }

function uploadStart(file) {
var post_params = this.settings.post_params;
post_params.product = document.getElementById("product").value;
this.setPostParams(post_params);
return true;
}
 </script>
</head>
  <div id="SWFUploadTarget">
<body>

  <div>
   <form action="upload2.jsp" method="get">
    <button id="btnBrowse" type="button" style="padding: 5px;" onClick="swfu.selectFiles(); this.blur();"><img src="images/page_white_add.png" style="padding-right: 3px; vertical-align: bottom;">请选择图片<span style="font-size: 7pt;">(2 MB Max)</span></button>
                    请输入产品ID<input type="text" name="product" id="product" value="">
   </form>
  </div>
  <div id="divFileProgressContainer" style="height: 75px;"></div>
  <div id="thumbnails"></div>
 </div>
</body>
<html>

后台使用SmartUpload：

<%@ page contentType="text/html;charset=gb2312" language="java" import="java.io.*,java.awt.Image,java.awt.image.*,com.sun.image.codec.jpeg.*,
java.sql.*,com.jspsmart.upload.*,java.util.*,com.yourcompany.util.*"%>
<%
SmartUpload mySmartUpload =new SmartUpload();
long file_size_max=4000000;
//add

//初始化
 mySmartUpload.initialize(pageContext);
//只允许上载此类文件
try {
mySmartUpload.setAllowedFilesList("jpg,gif");
//上载文件
mySmartUpload.upload();
} catch (Exception e){
%>
  <SCRIPT language=javascript>
  alert("只允许上传.jpg和.gif类型图片文件");
  window.location=''upfile.jsp'';
  </script>
<%
}
//try{

    com.jspsmart.upload.File myFile = mySmartUpload.getFiles().getFile(0);
    if (myFile.isMissing()){%>
   <SCRIPT language=javascript>
   alert("请先选择要上传的文件");
   window.location=''upfile.jsp'';
   </script>
    <%}
    else{
 
 String fileName2="",ext="",testvar="";
 String productname=mySmartUpload.getRequest().getParameter("product");
 String url="/uploadfile/"+productname+"/";      //应保证在根目录中有此目录的存在

 java.io.File file1 = new java.io.File(request.getRealPath("/") + url );
   if(!file1.exists())
  {
   file1.mkdir();
  }

      //String myFileName=myFile.getFileName(); //取得上载的文件的文件名
   ext= myFile.getFileExt();      //取得后缀名
   int file_size=myFile.getSize();     //取得文件的大小 
   String saveurl="";
   if(file_size<file_size_max){

int temp=1,temp2=0;
    String[] a=myFile.getFileName().split(".jpg");
    String myFileNameo = productname+"_00_pic_big";
 String myFileName = productname+"_0"+temp;
   
    Calendar calendar = Calendar.getInstance();
    String filename = String.valueOf(calendar.getTimeInMillis());
    saveurl=request.getRealPath("/")+url;
    saveurl+=myFileNameo+"."+ext;          //保存路径
   

   
    myFile.saveAs(saveurl,mySmartUpload.SAVE_PHYSICAL);
  //  java.io.File  f1   =   new  java.io.File (saveurl);
  //  java.io.File    f2   =   new   java.io.File (request.getRealPath("/")+url+myFileName+"_0_big.jpg");  
  //  f1.renameTo(f2); 
    //out.print(filename);
//-----------------------上传完成，开始生成缩略图------------------------- 
 
 
 
 
 com.yourcompany.util.DirList dirlist = new com.pixel.util.DirList();
  String[] dir =dirlist.list(request.getRealPath("/") + url );

for(int i=0;i<dir.length;i++){
  //for (String i : dir){
  String[] split = dir[i].split("\\.");
      if(split[1].equals("jpg")){  
      String[] split2=split[0].split("\\_");
       //split2[1]=01                
   if(Integer.parseInt(split2[1])>0&Integer.parseInt(split2[1])>=temp2){
   temp2=Integer.parseInt(split2[1])+1;
   }
   if(Integer.parseInt(split2[1])==0){
   temp2=1;
   }
     }
} 

if(temp2<=10){
myFileName = productname+"_0"+temp2;
}else{
myFileName = productname+"_"+temp2;
}

   
 //myFileName = mySmartUpload.getRequest().getParameter("product");
    java.io.File file = new java.io.File(saveurl);        //读入刚才上传的文件
    String newurl=request.getRealPath("/")+url+myFileName+"_70_min."+ext;  //新的缩略图保存地址
    Image src = javax.imageio.ImageIO.read(file);                     //构造Image对象
    float tagsize=70;
    int old_w=src.getWidth(null);                                     //得到源图宽
    int old_h=src.getHeight(null);  
    int new_w=0;
    int new_h=0;                            //得到源图长
    int tempsize;
    float tempdouble;
    if(old_w>old_h){
     tempdouble=old_w/tagsize;
    }else{
     tempdouble=old_h/tagsize;
    }
    new_w=Math.round(old_w/tempdouble);
    new_h=Math.round(old_h/tempdouble);//计算新图长宽
    BufferedImage tag = new BufferedImage(new_w,new_h,BufferedImage.TYPE_INT_RGB);
    tag.getGraphics().drawImage(src,0,0,new_w,new_h,null);       //绘制缩小后的图
    FileOutputStream newimage=new FileOutputStream(newurl);          //输出到文件流
    JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(newimage);      
    encoder.encode(tag);                                               //近JPEG编码
     
            //读入刚才上传的文件
    newurl=request.getRealPath("/")+url+myFileName+"_130_min."+ext;  //新的缩略图保存地址
    //Image src = javax.imageio.ImageIO.read(file);                     //构造Image对象
    tagsize=130;
  //  int old_w2=src2.getWidth(null);                                     //得到源图宽
  //  int old_h2=src2.getHeight(null);  
   // int new_w=0;
   // int new_h=0;                            //得到源图长
   // int tempsize;
  //  float tempdouble;
    if(old_w>old_h){
     tempdouble=old_w/tagsize;
    }else{
     tempdouble=old_h/tagsize;
    }
    new_w=Math.round(old_w/tempdouble);
    new_h=Math.round(old_h/tempdouble);//计算新图长宽
     tag = new BufferedImage(new_w,new_h,BufferedImage.TYPE_INT_RGB);
    tag.getGraphics().drawImage(src,0,0,new_w,new_h,null);       //绘制缩小后的图
    newimage=new FileOutputStream(newurl);          //输出到文件流
    encoder = JPEGCodec.createJPEGEncoder(newimage);      
    encoder.encode(tag);                                               //近JPEG编码
   
     newurl=request.getRealPath("/")+url+myFileName+"_180_min."+ext;  //新的缩略图保存地址
    //Image src = javax.imageio.ImageIO.read(file);                     //构造Image对象
    tagsize=180;
  //  int old_w2=src2.getWidth(null);                                     //得到源图宽
  //  int old_h2=src2.getHeight(null);  
   // int new_w=0;
   // int new_h=0;                            //得到源图长
   // int tempsize;
  //  float tempdouble;
    if(old_w>old_h){
     tempdouble=old_w/tagsize;
    }else{
     tempdouble=old_h/tagsize;
    }
    new_w=Math.round(old_w/tempdouble);
    new_h=Math.round(old_h/tempdouble);//计算新图长宽
     tag = new BufferedImage(new_w,new_h,BufferedImage.TYPE_INT_RGB);
    tag.getGraphics().drawImage(src,0,0,new_w,new_h,null);       //绘制缩小后的图
    newimage=new FileOutputStream(newurl);          //输出到文件流
    encoder = JPEGCodec.createJPEGEncoder(newimage);      
    encoder.encode(tag);                                               //近JPEG编码

     newurl=request.getRealPath("/")+url+myFileName+"_500_min."+ext;  //新的缩略图保存地址
    //Image src = javax.imageio.ImageIO.read(file);                     //构造Image对象
    tagsize=500;
  //  int old_w2=src2.getWidth(null);                                     //得到源图宽
  //  int old_h2=src2.getHeight(null);  
   // int new_w=0;
   // int new_h=0;                            //得到源图长
   // int tempsize;
  //  float tempdouble;
    if(old_w>old_h){
     tempdouble=old_w/tagsize;
    }else{
     tempdouble=old_h/tagsize;
    }
    new_w=Math.round(old_w/tempdouble);
    new_h=Math.round(old_h/tempdouble);//计算新图长宽
     tag = new BufferedImage(new_w,new_h,BufferedImage.TYPE_INT_RGB);
    tag.getGraphics().drawImage(src,0,0,new_w,new_h,null);       //绘制缩小后的图
    newimage=new FileOutputStream(newurl);          //输出到文件流
    encoder = JPEGCodec.createJPEGEncoder(newimage);      
    encoder.encode(tag);                                               //近JPEG编码

 newurl=request.getRealPath("/")+url+myFileName+"_800_min."+ext;  //新的缩略图保存地址
    //Image src = javax.imageio.ImageIO.read(file);                     //构造Image对象
    tagsize=800;
  //  int old_w2=src2.getWidth(null);                                     //得到源图宽
  //  int old_h2=src2.getHeight(null);  
   // int new_w=0;
   // int new_h=0;                            //得到源图长
   // int tempsize;
  //  float tempdouble;
    if(old_w>old_h){
     tempdouble=old_w/tagsize;
    }else{
     tempdouble=old_h/tagsize;
    }
    new_w=Math.round(old_w/tempdouble);
    new_h=Math.round(old_h/tempdouble);//计算新图长宽
     tag = new BufferedImage(new_w,new_h,BufferedImage.TYPE_INT_RGB);
    tag.getGraphics().drawImage(src,0,0,new_w,new_h,null);       //绘制缩小后的图
    newimage=new FileOutputStream(newurl);          //输出到文件流
    encoder = JPEGCodec.createJPEGEncoder(newimage);      
    encoder.encode(tag);                                               //近JPEG编码
 
 
  newimage.close(); 

   }
   else{
    out.print("<SCRIPT language=''javascript''>");
    out.print("alert(''上传文件大小不能超过"+(file_size_max/1000)+"K'');");
    out.print("window.location=''upfile.jsp;''");
    out.print("</SCRIPT>");
   }
  }
//}catch (Exception e){

//e.toString();

//}
%>

for(int i=0;i<dir.length;i++){
  //for (String i : dir){
  String[] split = dir[i].split("\\.");
      if(split[1].equals("jpg")){  
      String[] split2=split[0].split("\\_");
       //split2[1]=01                
   if(Integer.parseInt(split2[1])>0&Integer.parseInt(split2[1])>=temp2){
   temp2=Integer.parseInt(split2[1])+1;
   }
   if(Integer.parseInt(split2[1])==0){
   temp2=1;
   }
     }
} 

if(temp2<=10){
myFileName = productname+"_0"+temp2;
}else{
myFileName = productname+"_"+temp2;
}

import java.io.File;
import java.io.FilenameFilter;
import java.util.Arrays;
import java.util.Comparator;
import java.util.regex.Pattern;
public class DirList {
 public String[] list(String thepath) {  
  File path = new File(thepath);  
  String[] list;  
  list = path.list();  
  Arrays.sort(list, new AlphabeticComparator());
  return list;
 }
}

class DirFilter implements FilenameFilter { 
 private Pattern pattern;  public DirFilter(String regex) {
  pattern = Pattern.compile(regex);  }
 public boolean accept(File dir, String name) {  
  // Strip path information, search for regex:  
  return pattern.matcher(new File(name).getName()).matches();
  }
 }

class AlphabeticComparator implements Comparator {
 public int compare(Object o1, Object o2) {  
  String s1 = (String) o1;    String s2 = (String) o2;   
  return s1.toLowerCase().compareTo(s2.toLowerCase()); 
  }
 }

   NodeList childNodes = fatherNode.getChildNodes();
   System.out.println(childNodes.getLength());
   for(int j=0;j<2;j++){
    Node childNode=childNodes.item(j);
    //如果这个节点属于Element ,再进行取值
    if(childNode instanceof Element){
     //System.out.println("子节点名为:"+childNode.getNodeName()+"相对应的值为"+childNode.getFirstChild().getNodeValue());
     System.out.println("子节点名为:"+childNode.getNodeName()+"相对应的值为"+childNode.getFirstChild().getNodeValue());
    }
   }
  
  }
 
  public static void main(String[] args)throws Exception{
   Parse parse=new Parse();

 //我的XML文件
   parse.viewXML("D:/Tomcat 5.5/webapps/ROOT/story/best_story.xml");
  }
}

LoadModule jk_module modules/mod_jk.so
JkWorkersFile "C:\Program Files/Apache Software Foundation/Apache2.2/conf/workers.properties"
JkLogFile "C:\Program Files/Apache Software Foundation/Apache2.2/logs/mod_jk.log"
JkLogLevel severe

JkMount /*.do controller
JkMount /*.jsp controller
JkMount /WEB-INF/* controller
JkMount /lzj1/*.do controller

worker.tomcat1.host=192.168.10.55
worker.tomcat1.port=8009

worker.tomcat2.port=8009
worker.tomcat2.host=localhostworker.controller.type=lb

worker.controller.balanced_workers=tomcat1,tomcat2 
worker.controller.sticky_session=1
worker.ajp13.lbfactor=1

<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"
                 channelSendOptions="8">

          <Manager className="org.apache.catalina.ha.session.DeltaManager"
                   expireSessionsOnShutdown="false"
                   notifyListenersOnReplication="true"/>

          <Channel className="org.apache.catalina.tribes.group.GroupChannel">
            <Membership className="org.apache.catalina.tribes.membership.McastService"
                        address="228.0.0.4"
                        port="45564"
                        frequency="500"
                        dropTime="3000"/>
            <Receiver className="org.apache.catalina.tribes.transport.nio.NioReceiver"
                      address="auto"
                      port="4000"
                      autoBind="100"
                      selectorTimeout="5000"
                      maxThreads="6"/>

            <Sender className="org.apache.catalina.tribes.transport.ReplicationTransmitter">
              <Transport className="org.apache.catalina.tribes.transport.nio.PooledParallelSender"/>
            </Sender>
            <Interceptor className="org.apache.catalina.tribes.group.interceptors.TcpFailureDetector"/>
            <Interceptor className="org.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptor"/>
          </Channel>

          <Valve className="org.apache.catalina.ha.tcp.ReplicationValve"
                 filter=""/>
          <Valve className="org.apache.catalina.ha.session.JvmRouteBinderValve"/>

          <Deployer className="org.apache.catalina.ha.deploy.FarmWarDeployer"
                    tempDir="/tmp/war-temp/"
                    deployDir="/tmp/war-deploy/"
                    watchDir="/tmp/war-listen/"
                    watchEnabled="false"/>

          <ClusterListener className="org.apache.catalina.ha.session.JvmRouteSessionIDBinderListener"/>
          <ClusterListener className="org.apache.catalina.ha.session.ClusterSessionListener"/>
        </Cluster>

/*<%
   System.out.println("===========================");
%>
*/

<%@ page contentType="text/html; charset=GBK" %>
<%@ page import="java.util.*" %>
<html><head><title>Cluster App Test</title></head>
<body>
Server Info:
<%
out.println(request.getLocalAddr() + " : " + request.getLocalPort()+"<br>");%>
<%
  out.println("<br> ID " + session.getId()+"<br>");
  // 如果有新的 Session 属性设置
  String dataName = request.getParameter("dataName");
  if (dataName != null && dataName.length() > 0) {
     String dataValue = request.getParameter("dataValue");
     session.setAttribute(dataName, dataValue);
  }
  out.print("<b>Session 列表</b>");
  Enumeration e = session.getAttributeNames();
  while (e.hasMoreElements()) {
     String name = (String)e.nextElement();
     String value = session.getAttribute(name).toString();
     out.println( name + " = " + value+"<br>");
         System.out.println( name + " = " + value);
   }
%>
  <form action="index.jsp" method="POST">
    名称:<input type=text size=20 name="dataName">
     <br>
    值:<input type=text size=20 name="dataValue">
     <br>
    <input type=submit>
   </form>
</body>
</html>

 <logic:present name="results">
     <table border="1">
    <logic:iterate id="element" name="results">
    <tr>
      <td width="100"><bean:write name="element" property="name"/></td>
   <td width="100"><bean:write name="element" property="email"/></td>
      <td width="100"><bean:write name="element" property="sname"/></td>
            <td width="100"><bean:write name="element" property="times"/></td>

<td id="result"></td>
   </tr>
</logic:iterate>
 </logic:present>

学生：t_student
id
name
email

科目：t_subjects
id
subjects name
student_id

考试：t_test
id
student_id
subjects_id
month
times

学生表和科目表，学生表和考试表，科目和考试都是一对多关系。建立好索引和约束，然后由hibernate自动生成hbm文件，并在学生表、科目表的hbm文件里设置inverse="true" cascade="all" lazy="true"。

就大致配置好了，然后假如要录入这样一条涉及到3个表的记录：
学生姓名、email、科目名称、月份、考试次数
就只需要写一个简单的方法调用session.save就可以保存所有内容了：

public ActionForward execute(ActionMapping mapping, ActionForm form,
   HttpServletRequest request, HttpServletResponse response) {
  DynaActionForm student_registerForm = (DynaActionForm) form;// TODO Auto-generated method stub
  //receive from actionform
  String strname = student_registerForm.getString("name");
  String stremail = student_registerForm.getString("email");
  String strsubjectname = student_registerForm.getString("subjectname");
  int intmonth = Integer.parseInt(student_registerForm.getString("month"));
  int inttimes = Integer.parseInt(student_registerForm.getString("times"));
  TStudent tStudent = new TStudent();
  tStudent.setName(strname);
  tStudent.setEmail(stremail);
  //set the subject
  TSubjects Tsubjects = new TSubjects();
  Tsubjects.setTStudent(tStudent);
  Tsubjects.setName(strname);
  tStudent.getTSubjectses().add(Tsubjects);
  //set the test
  TTest Ttest = new TTest();
  Ttest.setTStudent(tStudent);
  Ttest.setMonth(intmonth);
  Ttest.setTimes(inttimes);
  tStudent.getTTests().add(Ttest);
  //insert all
  tstudentDAO.insert(tStudent);
  return mapping.findForward("ok");
 }

 tstudentDAO只有一个操作：
session.save(tStudent);

之后可以看到3个表里的记录都同时增加好了。